I don't see how your comment contradicts the statement "The us generally will extradite if your justice system isn't corrupt. There are exceptions, but everyone has them."
The fact that there is a US law to prevent US service members specifically from being detained by the ICC specifically, has little bearing on the statement that "The US generally will extradite".
These are the most meaningful exemptions. Sure, it'll extradite petty criminals, but it absolutely won't extradite politically useful[1] criminals, and will absolutely not allow the latter to have a fair trial.
If that's acceptable and civilized behavior, I don't see why you can complain that Russia won't extradite a politically useful[1] criminal.
[1] In the sense that their crimes are furthering the state's geopolitical agenda.
That's a reasonable argument. I think that the response that comes next is "the Russian geopolitical agenda is bad", but that's a separate topic - I think you've convinced me on this point.
The fact that there is a US law to prevent US service members specifically from being detained by the ICC specifically, has little bearing on the statement that "The US generally will extradite".